Scons: rebuilding `build/opt/mongo/util/net/hostandport_gen.dwo' because the dependency order changed: At one point while working on HHVM at Facebook I finally snapped, spent 2-3 days doing nothing but. Long compile times disrupt flow, and it requires great ongoing mental effort to work around slow compilation.
#Gsplit dwarf code
`src/mongo/base/data_type_terminated.cpp' is a new dependencyĬompiling build/opt/mongo/base/data_type_terminated.os Note: If your program targets an NVIDIA GPU device by using the -qoffload option, -gsplit-dwarf affects the debug information for host code only. I emphatically disagree - compile times are definitely on my short-list of worst things about C++.
`src/mongo/base/data_type_terminated.cpp' is no longer a dependency Scons: rebuilding `build/opt/mongo/base/data_type_terminated.dwo' because: `src/mongo/base/shim.cpp' is a new dependency
In addition objdumps -dwarffollow-links now also affects its other display options, so that for example, when combined with -syms it will cause the symbol tables in any linked debug info files to also be displayed. `src/mongo/base/shim.cpp' is no longer a dependency (This usually happens when gccs -gsplit-dwarf option is used). This option is intended for use by the compiler as part of the -gsplit-dwarf option, which splits debug information between the. Scons: rebuilding `build/opt/mongo/base/shim.dwo' because: Remove the contents of all DWARF.dwo sections, leaving the remaining debugging sections and all symbols intact. clang++-4.0 -o llvmtest llvm-config-4.0 -cxxflags -libs engine llvmtest.cpp. So lets create a simple llvmtest.cpp file: Note that I use std::cout so that we actually use the context variable (so the compiler wont remove it during the compilation phase). The second build will rebuild files, but it should not: In my moderate-sized real-world project (about 700 C++ source files, about 130k lines of code), adding -gsplit-dwarf reduced the time of a single-file recompile+relink from 7.2 seconds to 5.8 seconds, which isnt bad at all for a single extra compiler flag that you never have to think about again (assuming that it works with all your other debugging tools). Next step is to test the actual LLVM library itself. GCC uses the DWLLEstartxendx description. This setting replaces the previous hack, setting binutilsversion0. Due to lack of support for uleb128 label differences, the compact DWLLEoffsetpair description cannot be used. buildscripts/scons.py -ssl -install-mode=hygienic -implicit-cache -j 24 -disable-warnings-as-errors -modules= -variables-files= -link-model=dynamic CCFLAGS=-gsplit-dwarf build/install/bin/mongod -debug=explain add a linuxusedebugfission gyp variable for -gsplit-dwarf Since -gsplit-dwarf breaks some extremely useful build tools (eg ccache and icecc), it deserves its own gyp variable.
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